Fig. 4.

Wheat zones of China. I Northern Spring Wheat Zone, II Northern Winter Wheat Zone, III Middle and Low Yangtze Valleys Autumn-Sown Spring Wheat Zone, IV Northeastern Spring Wheat Zone, VI Southwestern Autumn-Sown Spring Wheat Zone, VII Yellow and Huai River valleys Facultative Wheat Zone, VIII Qinghai-Tibetan plateau Spring-Winter Wheat Zone, IX Northwestern Spring Wheat Zone, X Southern Autumn-Sown Spring Wheat Zone, XI Xinjiang Winter-Spring Zone. ➀Yangling, ➁Longxian, ➂Shijiazhuang, ➃ Yuanmou, ➄Guiyang, ➅Wuwei, ➆Huzhu, ➇Yi’an.